from sys import stdin
input = stdin.buffer.readline
print('No' if int(input()) < 30 else 'Yes') from sys import stdin input = stdin.buffer.readline input stdin.buffer.readline stdin.buffer stdin buffer readline print('No' if int(input()) < 30 else 'Yes') print 'No' if int(input()) < 30 else 'Yes' int(input()) < 30 int(input()) int input() input 30 'No' 'Yes' input = stdin.buffer.readline stdin.buffer.readline input
from sys import stdin
input = stdin.buffer.readline
print('No' if int(input()) < 30 else 'Yes')
